Bandar Seri Begawan is the capital and largest city of Brunei, located within the Brunei–Muara District. It serves as the nation's primary urban center and is nominally the country's only city. The municipal area covers 100.36 square kilometers and has an estimated population of 72,133 as of 2025.
As the seat of government, the city functions as a major commercial and cultural hub for the country. It is situated in the Brunei–Muara District, which is the smallest yet most populous district in Brunei, housing over 70 percent of the national population. The city was previously known as Brunei Town before being renamed in 1970 to honor Omar Ali Saifuddien III, the 28th Sultan of Brunei.